<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>WebSocket客户端</title>
</head>
<body>
<script type="text/javascript">
    var socket;

    //如果浏览器支持WebSocket
    if(window.WebSocket){
        //参数就是与服务器连接的地址
        var port ="12345";
        var url = "wstest";
        socket = new WebSocket("ws://localhost:"+port+"/"+url);

        //客户端收到服务器消息的时候就会执行这个回调方法
        socket.onmessage = function (event) {
            var ta = document.getElementById("responseText");
            ta.value = ta.value + "\n"+event.data;
        }

        //连接建立的回调函数
        socket.onopen = function(event){
            var ta = document.getElementById("responseText");
            ta.value = "连接开启";
        }

        //连接断掉的回调函数
        socket.onclose = function (event) {
            var ta = document.getElementById("responseText");
            ta.value = ta.value +"\n"+"连接关闭";
        }
    }else{
        alert("浏览器不支持WebSocket！");
    }

    //发送数据
    function send(message){
        if(!window.WebSocket){
            return;
        }

        var js = {boardId:"1",content:message}
        //当websocket状态打开

        if(socket.readyState == WebSocket.OPEN){
            socket.send(JSON.stringify(js));
        }else{
            alert("连接没有开启");
        }

    }
</script>
<form onsubmit="return false">
    <textarea name = "message" style="width: 400px;height: 200px"></textarea>

    <input type ="button" value="发送数据" onclick="send(this.form.message.value);">

    <h3>服务器输出：</h3>

    <textarea id ="responseText" style="width: 400px;height: 300px;"></textarea>
    <input type="button" onclick="javascript:document.getElementById('responseText').value=''" value="清空数据">
</form>
</body>
</html>